org.apache.geode.connectors.jdbc

Class JdbcWriter<K,V>

java.lang.Object

org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback

org.apache.geode.connectors.jdbc.JdbcWriter<K,V>

All Implemented Interfaces:

CacheCallback, CacheWriter<K,V>, Declarable

@Experimental
public class JdbcWriter<K,V>
extends org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback
implements CacheWriter<K,V>

This class provides synchronous write through to a data source using JDBC.

Since:

Geode 1.4

Field Summary

Fields inherited from class org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback

cache

Constructor Summary

Constructors

Constructor and Description
JdbcWriter()

Method Summary

Modifier and Type	Method and Description
void	beforeCreate(EntryEvent<K,V> event) Called before an entry is created.
void	beforeDestroy(EntryEvent<K,V> event) Called before an entry is destroyed.
void	beforeRegionClear(RegionEvent<K,V> event) Called before a region is cleared.
void	beforeRegionDestroy(RegionEvent<K,V> event) Called before a region is destroyed.
void	beforeUpdate(EntryEvent<K,V> event) Called before an entry is updated.

Methods inherited from class org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback

checkInitialized, eventCanBeIgnored, getSqlHandler

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.geode.cache.CacheCallback

close

Methods inherited from interface org.apache.geode.cache.Declarable

init, initialize

Constructor Detail

JdbcWriter

public JdbcWriter()

Method Detail

beforeUpdate

public void beforeUpdate(EntryEvent<K,V> event)
                  throws CacheWriterException

Description copied from interface: CacheWriter

Called before an entry is updated. The entry update is initiated by a put or a get that causes the loader to update an existing entry. The entry previously existed in the cache where the operation was initiated, although the old value may have been null. The entry being updated may or may not exist in the local cache where the CacheWriter is installed.

Specified by:

beforeUpdate in interface CacheWriter<K,V>

Parameters:

event - an EntryEvent that provides information about the operation in progress

Throws:

CacheWriterException - if thrown will abort the operation in progress, and the exception will be propagated back to caller that initiated the operation

See Also:

Region.put(Object, Object), Region.get(Object)

beforeCreate

public void beforeCreate(EntryEvent<K,V> event)
                  throws CacheWriterException

Description copied from interface: CacheWriter

Called before an entry is created. Entry creation is initiated by a create, a put, or a get. The CacheWriter can determine whether this value comes from a get or not by evaluating the Operation's Operation.isLoad() method. The entry being created may already exist in the local cache where this CacheWriter is installed, but it does not yet exist in the cache where the operation was initiated.

Specified by:

beforeCreate in interface CacheWriter<K,V>

Parameters:

event - an EntryEvent that provides information about the operation in progress

Throws:

CacheWriterException - if thrown will abort the operation in progress, and the exception will be propagated back to caller that initiated the operation

See Also:

Region.create(Object, Object), Region.put(Object, Object), Region.get(Object)

beforeDestroy

public void beforeDestroy(EntryEvent<K,V> event)
                   throws CacheWriterException

Description copied from interface: CacheWriter

Called before an entry is destroyed. The entry being destroyed may or may not exist in the local cache where the CacheWriter is installed. This method is not called as a result of expiration or Region.localDestroy(Object).

Specified by:

beforeDestroy in interface CacheWriter<K,V>

Parameters:

event - an EntryEvent that provides information about the operation in progress

Throws:

CacheWriterException - if thrown will abort the operation in progress, and the exception will be propagated back to caller that initiated the operation

See Also:

Region.destroy(Object)

beforeRegionDestroy

public void beforeRegionDestroy(RegionEvent<K,V> event)
                         throws CacheWriterException

Description copied from interface: CacheWriter

Called before a region is destroyed. The CacheWriter will not additionally be called for each entry that is destroyed in the region as a result of a region destroy. If the region's subregions have CacheWriters installed, then they will be called for the cascading subregion destroys. This method is not called as a result of Region.close(), Cache.close(boolean), or Region.localDestroyRegion(). However, the Region.close() method is invoked regardless of whether a region is destroyed locally. A non-local region destroy results in an invocation of this method is followed by an invocation of Region.close().

WARNING: This method should not destroy or create any regions itself or a deadlock will occur.

Specified by:

beforeRegionDestroy in interface CacheWriter<K,V>

Parameters:

event - a RegionEvent that provides information about the operation

Throws:

CacheWriterException - if thrown, will abort the operation in progress, and the exception will be propagated back to the caller that initiated the operation

See Also:

Region.destroyRegion()

beforeRegionClear

public void beforeRegionClear(RegionEvent<K,V> event)
                       throws CacheWriterException

Description copied from interface: CacheWriter

Called before a region is cleared. The CacheWriter will not additionally be called for each entry that is cleared in the region as a result of a region clear.

WARNING: This method should not clear/destroy any regions

Specified by:

beforeRegionClear in interface CacheWriter<K,V>

Parameters:

event - a RegionEvent that provides information about the operation

Throws:

CacheWriterException - if thrown, will abort the operation in progress, and the exception will be propagated back to the caller that initiated the operation

See Also:

Region.clear()